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Reguarding this articulated bus it is a 1946 Kaiser articulated it was advertised as "man made magic". Power was a cummins diesel mounted under the floor. These buses were also used in San Francisco, Bakersfield, & LA.

Info from Coachbult.com - Kaiser

In 1946 Kaiser built a 60-foot articulated over-the-road coach was constructed as a speculation and operated between Los Angeles and San Francisco by Santa Fe Trail Transportation Co., a member of the National Trailways association. The body was constructed of a magnesium¬-aluminum alloy. A 6-cylinder Cummins diesel engine was mounted beneath the floor of the forward section, with a separate air-conditioning unit under the floor in the rear. There was space for 378 cubic feet of baggage in under¬floor compartments. Suspension was the so-called "Torsilastic" system of rubber bonded between the walls of con¬centric tubes, a design pioneered by Twin Coach and later used by Flxible and Bus & Car (on the Silver Eagle). The pilot was never duplicated; it operated in regular service until 1951.